Lamp base



FIG. 1 is a top plan view of a lamp base showing my new design;

FIG. 2 is a front elevational view thereof, the rear view being identical;

FIG. 3 is a bottom plan view thereof;

FIG. 4 is a fragmentary side elevational view thereof, the lower portion of the base being omitted for convenience of illustration, the opposite side of the upper portion being a mirror image of the side shown;

FIG. 5 is a cross-sectional view of the upper portion of the base as taken along line 5--5 of FIG. 1. 

The ornamental design for a lamp base, as shown and described. 